As a knitter and wearer of kilt hose, I'll jump in and advise the wearer to opt for the smallest size and weight of yarn that's available. Big yarn, on my feet, "digs in" after a while of standing and hurts my heels. Small yarn makes a smoother surface to stand on and feels better, longer. Also, to my eye, the smaller stitches made by smaller yarn makes a better visual line, especially in color work, whereas big yarn makes big stitches which I personally don't like as well.
One last piece of advice: make sure you wash wool hose COLD and lay them flat to dry. Otherwise, you'll wind up with beautiful (and expensive) felt Christmas stockings!
--dbh
When given a choice, most people will choose.
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